Re: High latency with VirtIO NIC

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On Thu, Mar 24, 2011 at 22:08, Avi Kivity <avi@xxxxxxxxxx> wrote:
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3582 ttl=64 time=3.08 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3583 ttl=64 time=1.10 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3584 ttl=64 time=1.03 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3585 ttl=64 time=3.55 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3586 ttl=64 time=1.29 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3587 ttl=64 time=0.710 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3588 ttl=64 time=64.4 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3589 ttl=64 time=0.271 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3590 ttl=64 time=0.563 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3591 ttl=64 time=1.66 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3592 ttl=64 time=0.939 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3593 ttl=64 time=0.819 ms
>> 64 bytes from app211 (192.168.1.211): icmp_seq=3594 ttl=64 time=16.5 ms
>>
>> --------------------------- ping KVM guest (app211) from the host
>> ---------------------------
>>
>> any idea?
>>
>
> Isn't it normal? ÂWith heavy load, packets start to queue.


Thank you, if the performance drop (from 0.15ms to 1-64ms) at this
workload is normal,  I am okay with it.

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